backport: [multiple changes]

backport: [multiple changes]

2019-08-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91445
	* gcc.dg/torture/pr91445.c: New testcase.

	Backport from mainline
	2019-07-05  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91091
	* tree-ssa-alias.h (get_continuation_for_phi): Add tbaa_p parameter.
	(walk_non_aliased_vuses): Likewise.
	* tree-ssa-alias.c (maybe_skip_until): Pass down tbaa_p.
	(get_continuation_for_phi): New tbaa_p parameter and pass
	it down.
	(walk_non_aliased_vuses): Likewise.
	* tree-ssa-pre.c (translate_vuse_through_block): Likewise.
	* tree-ssa-scopedtables.c (avail_exprs_stack::lookup_avail_expr):
	Likewise.
	* tree-ssa-sccvn.c (struct vn_walk_cb_data): Add tbaa_p flag.
	(vn_reference_lookup_3): Handle and pass down tbaa_p flag.
	(vn_reference_lookup_pieces): Adjust.
	(vn_reference_lookup): Remove alias-set altering, instead pass
	down false as tbaa_p.

	* gcc.dg/tree-ssa/pr91091-2.c: New testcase.

	2019-07-04  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.h (vn_reference_lookup): Add last_vuse_ptr
	argument.
	* tree-ssa-sccvn.c (last_vuse_ptr, vn_walk_kind): Move
	globals into...
	(struct vn_walk_cb_data): New callback data struct.
	(vn_reference_lookup_2): Adjust.
	(vn_reference_lookup_3): Likewise.
	(vn_reference_lookup_pieces): Likewise.
	(vn_reference_lookup): Likewise, get last_vuse_ptr argument.
	(visit_reference_op_load): Adjust.

From-SVN: r274532